In the world, Tadg (Tadg 
) is a very rare unisex forename. The first name Tadg is habitual in Ireland, where it is a rare masculine name, and Israel, where it is a rare unisex name. Likewise, Tadg is the last name as well as the forename.
| tadg óg ó húigínn Irish poet and grammarian, born c.1581 (b. 1582) |
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| tadg mac conchobair King of Connacht |
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| tadg mac conchobair king of Ailech |
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| tadg mac cathail King of Connaught |
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| tadg mac ruaidrí ua conchobair King of Connaught |
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| tadg in eich gil King of Connaught |
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| tadg ruad mac toirrdelbaig |
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| tadg mac toirdhealbhaigh ruaidh |
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| tadg gláe mac diarmata ua briain |
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| tadg mac muiredaig meic cárthaig |
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